作者:Seiji Shirakawa、Lijia Wang、Rongjun He、Satoru Arimitsu、Keiji Maruoka
DOI:10.1002/asia.201402194
日期:2014.6
phase‐transfer reaction system can be applied to highly enantioselective conjugate addition and aldol reactions under the influence of chiral bifunctional ammonium bromides as key catalysts. The structure of the chiral ammonium enolate intermediate is discussed based on the single‐crystal X‐ray structures of relevant ammonium salts and the importance of bifunctional design of catalyst is clearly explained in the
尽管一般认为使用季铵盐催化的相转移反应需要碱添加剂,但我们发现,即使没有任何碱添加剂,在存在亲脂性季铵溴化物的情况下,在水中将3-取代的羟吲哚共轭添加到硝基烯烃中也能顺利进行。 –有机两相条件。研究了这种新型的无碱中性相转移反应体系的机理,并提出了假定的催化循环以及水和相转移催化剂的亲脂性的有趣影响。无碱中性相转移反应体系可在手性双官能溴化铵作为关键催化剂的情况下用于高对映选择性共轭加成和醛醇缩合反应。